Horticulture
OSU Extension is dedicated to bringing you the latest research-based information for your lawn, garden, landscape and other horticulture concerns. Visit us for one-on-one help in a variety of areas, including gardening, tree planting, plant selection, pest control and home pesticide use.
Soil, Water and Forage Testing
The OSU Soil, Water and Forage Analytical Laboratory works in conjunction with OSU Extension. You can drop off your soil samples at the OSU Extension Office.
315 W 6th Ave, Suite 103
Stillwater, Okla. 74074
Monday - Friday
8:00 a.m. - 4:00 p.m.
If you are not in Payne County, find your local OSU Extension Office.
Benefits of Soil Testing: The Best Management Practice
- Increases productivity by identifying soil nutrients or soil chemical factors that are limiting plant growth
- Increases fertilizer use efficiency by indicating appropriate rates for different soils and crops
- Protects the environment by preventing over fertilization when recommendations are followed
- Identifies polluted or contaminated soils.
Frequently Asked Questions
How much does a Routine soil sample cost?
$10.00 for N-P-K analysis with pH and Buffer index, includes recommendations. ( pH (1:1), Lime requirement (Sikora Buffer), NO3-N, Soil test P & K by Mehlich 3 (MIII))
How often should a soil be tested?
A soil test should be conducted if fertilizer is going to be applied or when problems occur during the growing season. Once every year is recommended when nitrogen fertilizer is applied, and at least once every three years if P and K are concerned.
How should soil samples be taken?
For information, visit the fact sheet: How to Get a Good Soil Sample. Several separated samples may be needed from a yard to reflect the different uses.
How should soil samples be taken?
For information, visit the fact sheet: How to Get a Good Soil Sample. Several separated samples may be needed from a yard to reflect the different uses.
Who can remove bees from my property?
Contact (405) 880-5503
I have a lot of damage from the ice storm. Where do I find a certified arborist to prune out the dead branches in my trees?
Oklahoma Forestry Services provides this information and a list of certified arborist in your area.
When is the best time of year to prune plants?
Generally, pruning is done when the plant is dormant or after flowering. This minimizes stress on the plant because energy levels are low during dormancy. In Oklahoma, dormancy is in January and February, i.e. the coldest months. Refer to OSU fact sheet Pruning Ornamental Trees, Shrubs and Vines for more information on pruning.
Why are my pine tree needles turning yellow and falling off?
If the yellowing needles are located toward the inside of the tree, rather than the new growth on the tips of the stems, this is normal. It's called seasonal needle drop, and occurs about every 3 years, depending on the kind of pine it is. No need to worry.